British world heavyweight champion Tyson Fury is to face a UK Anti-Doping (Ukad) charge alleging the presence of a banned substance.
Fury was provisionally suspended in June, though that has been lifted pending a hearing, Ukad has revealed.
The 27-year-old had said on Tuesday he would sue the organisation over claims he used a performance-enhancing substance.
Fury’s cousin and fellow boxer Hughie has also been charged.
The Sunday Mirror reported on 26 June that traces of banned substance nandrolone were found in a urine sample taken from Fury in February 2015.
He denied the claim and his legal team says the result of tests from March and May 2015 were contradictory.
Fury beat Ukrainian Wladimir Klitschko to win the WBA and WBO heavyweight titles in November.
Ukad said its statement was in response to comments from Tyson Fury and his team.
A spokeswoman said: “UK Anti-Doping can confirm that both boxers were charged on 24 June, 2016 with presence of a prohibited substance.”
Fury announced on 24 June that he was pulling out of a planned Klitschko rematch, scheduled for 9 July, saying he had injured his ankle in training.
The charges will be considered at a hearing of the independent National Anti-Doping Panel on a date to be confirmed.